Check if key is in the dictionary?

2018-06-09 15:34:22

This question already has an answer here:

Check if a given key already exists in a dictionary 18 answers

Just use the in operator (which is accompanied by the not in operator):

if (1, 'a') in edges:

if (1, 'a') not in edges:

Below is an excerpt from the documentation of Python's dictionary type, where d is a dictionary:

key in d

Return True if d has a key key , else False .

key not in d

Equivalent to not key in d .

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